So I have wired the proximity switch as per my diagram and it seems to be working as an E stop rather than a home switch. Its very confusing. Although its an NC proximity switch it seems to be working the opposite way round. When no metal is near the sensor the light on the back of it is on and the message external E stop requested appears and I can not reset Mach 3. If metal is placed near the proximity sensor the light goes off and I am able to select reset and I can jog. As soon as I remove the metal object the steppers stop and the reset button is activated again.
To my mind its as if its set up as an E stop and its acting as a normally open switch. Confused.com
Anyone have any ideas?